TN 25686 Idler Drum for Weldment Tennant for Tennant Scrubbers. A one piece steel idler weldment which is inserted in the drive and non-drive end of the main cylinder scrub brush. Fits Tennant models 7400, and early M20, M30, and T20 riding floor scrubbers. There may be a serial number break referencing changes to the drive/idler assemblies on the M20, M30, and T20 models. Please refer to your parts manual before ordering. Priced Each. Replaces Tennant 25686. Our Part Number TN 25686